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US 7,742,041 B2Granted
Liquid crystal display with touch sensing using variable capacitor sensor and photosensor
AssigneeSamsung Electronics Co., Ltd.
InventorsJoo-Hyung Lee, Kee-Han Uh, Jong-Woung Park, Sang-Jin Park
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Abstract
A liquid crystal display includes a first panel, a second panel facing the first panel and spaced apart from the first panel, a liquid crystal layer disposed between the first panel and the second panel, a variable capacitor having a capacitance that varies by a touch and generating a control voltage that has a magnitude depending on the capacitance, and a sensing element disposed on the second panel and generating a sensing signal based on the control voltage.
Claims25
A liquid crystal display device comprising:
- a first panel;
- a second panel facing the first panel and spaced apart from the first panel;
- a liquid crystal layer disposed between the first panel and the second panel;
- and
- a pixel including a display circuit and a sensing circuit;
- wherein the display circuit comprises a liquid crystal capacitor;
- and
- wherein the sensing circuit comprises:
- a variable capacitor having a capacitance that varies in response to a touch applied on one of the first panel and the second panel, the variable capacitor generating a control voltage that has a magnitude depending on the capacitance;
- and
- a sensing element disposed on the second panel, wherein the sensing element generates a sensing signal based on the control voltage, and a control terminal of the sensing element is coupled with the variable capacitor.
8 more elements
A liquid crystal display device comprising:
- an image scanning line;
- an image data line intersecting the image scanning line;
- a sensor data line intersecting the image scanning line, the sensor data line being separated from the image scanning line and the image data line;
- and
- a pixels including a display circuit and a sensing circuit,
- wherein the display circuit comprises a liquid crystal capacitor and a first switching element connected to the liquid crystal capacitor, the image scanning line, and the image data line, the sensing circuit comprises a variable capacitor having a capacitance that varies in response to a touch applied on a display panel of the liquid crystal display device, a sensing element connected to the variable capacitor, and a second switching element connected to the sensing element and the sensor data line, and
- wherein each of the second switching element and the sensing element includes a control terminal, an input terminal, and an output terminal, the input terminal of the second switching element is coupled with the output terminal of the sensing element, the output terminal of the second switching element is connected to the sensing data line, and the control terminal of the sensing element is coupled with the variable capacitor.
4 more elements
Dependencies are inferred from the claim text.